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Updated: May 5, 2026

09:32
Generation of Myospheres From hESCs by Epigenetic Reprogramming
Published on: June 21, 2014
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ヒペリオンのスポンジのような外観.
P C Thomas1, J W Armstrong, S W Asmar
1Center for Radiophysics and Space Research, Cornell University, Ithaca, New York 14853, USA. pct2@cornell.edu
Nature
|July 6, 2007
まとめ
土星 サターン
科学分野:
- 惑星科学 惑星科学
- 天文学 天文学
- 天体物理学 天体物理学
背景:
- ハイペリオン (Hyperion) は,土星の最大の不規則な月で,混沌とした回転を示しています.
- その表面は小さな氷の月の中でユニークですが,その理由は不明です.
研究 の 目的:
- 土星の衛星ヒペリオン (Hyperion) のユニークな表面の特徴と物理的性質を調査する.
- ヒペリオンの独特な表面の姿とクレーター保存の原因を特定するために.
主な方法:
- ハイペリオン表面の高解像度の画像の分析.
- 表面クレーターのマッピング.
- ヒペリオンの大きさ,質量,平均密度の決定.
主要な成果:
- Hyperionは,キロメートルのスケールで特徴的なスポンジのような質感を示しています.
- よく保存されたクレーター (2-10 km) の高密度が観察されました.
- 平均密度は 544 +/- 50 kg m(-3 で計算され,ポロ性が 40% を超えることを示しています.
結論:
- ハイペリオンの高孔性 (>40%) は,そのユニークな表面の重要な要因です.
- 毛細さは,噴出物を減らすことで,クレーターの保存を高める可能性が高い.
- これは,ヒペリオンの異常な外観とクレーターに囲まれた景色を説明します.
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